Koichi Okuzawa

4.1k total citations
97 papers, 3.4k citations indexed

About

Koichi Okuzawa is a scholar working on Physiology, Aquatic Science and Reproductive Medicine. According to data from OpenAlex, Koichi Okuzawa has authored 97 papers receiving a total of 3.4k indexed citations (citations by other indexed papers that have themselves been cited), including 69 papers in Physiology, 47 papers in Aquatic Science and 31 papers in Reproductive Medicine. Recurrent topics in Koichi Okuzawa's work include Reproductive biology and impacts on aquatic species (69 papers), Aquaculture Nutrition and Growth (44 papers) and Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities (25 papers). Koichi Okuzawa is often cited by papers focused on Reproductive biology and impacts on aquatic species (69 papers), Aquaculture Nutrition and Growth (44 papers) and Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities (25 papers). Koichi Okuzawa collaborates with scholars based in Japan, United States and Netherlands. Koichi Okuzawa's co-authors include Hirohiko Kagawa, Hideki Tanaka, Hiromi Ohta, Koichiro Gen, Hideki Tanaka, Keiji Hirose, H. Kagawa, Masafumi Amano, Norio Iinuma and Naoki Kumakura and has published in prestigious journals such as The Journal of Comparative Neurology, Annals of the New York Academy of Sciences and European Journal of Biochemistry.

In The Last Decade

Koichi Okuzawa

95 papers receiving 3.2k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Koichi Okuzawa Japan 34 2.5k 1.5k 1.4k 1.4k 539 97 3.4k
Evaristo L. Mañanós Spain 33 2.4k 1.0× 1.4k 1.0× 1.5k 1.1× 987 0.7× 530 1.0× 85 3.2k
Sylvie Dufour France 36 2.2k 0.9× 1.3k 0.9× 1.3k 0.9× 1.1k 0.8× 744 1.4× 116 3.7k
Makito Kobayashi Japan 33 2.2k 0.9× 1.3k 0.9× 1.1k 0.7× 888 0.7× 415 0.8× 98 3.1k
Finn‐Arne Weltzien Norway 30 1.9k 0.7× 1.2k 0.8× 1.2k 0.8× 713 0.5× 559 1.0× 94 3.1k
Hirohiko Kagawa Japan 37 3.3k 1.3× 1.9k 1.3× 2.1k 1.5× 1.1k 0.8× 719 1.3× 103 4.0k
H.J.Th. Goos Netherlands 37 2.3k 0.9× 1.2k 0.8× 1.3k 0.9× 1.2k 0.9× 391 0.7× 93 3.2k
Z. Yaron Israel 30 1.9k 0.7× 979 0.7× 1.2k 0.9× 716 0.5× 542 1.0× 71 2.7k
Michiya Matsuyama Japan 28 1.4k 0.5× 1.2k 0.8× 774 0.5× 770 0.6× 452 0.8× 131 2.4k
Bernard Breton France 42 3.7k 1.5× 1.6k 1.1× 2.5k 1.7× 1.3k 1.0× 1.2k 2.1× 161 4.9k
Kohei Yamauchi Japan 41 3.1k 1.2× 2.1k 1.4× 2.0k 1.4× 1.1k 0.8× 892 1.7× 118 4.6k

Countries citing papers authored by Koichi Okuzawa

Since Specialization
Citations

This map shows the geographic impact of Koichi Okuzawa's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Koichi Okuzawa with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Koichi Okuzawa more than expected).

Fields of papers citing papers by Koichi Okuzawa

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Koichi Okuzawa. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Koichi Okuzawa. The network helps show where Koichi Okuzawa may publish in the future.

Co-authorship network of co-authors of Koichi Okuzawa

This figure shows the co-authorship network connecting the top 25 collaborators of Koichi Okuzawa. A scholar is included among the top collaborators of Koichi Okuzawa based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Koichi Okuzawa. Koichi Okuzawa is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Sato, Taku, Masato Kobayashi, Koichi Okuzawa, et al.. (2018). Impact of fishing losses of males on the reproductive output of the large protogynous fish, Choerodon schoenleinii. Marine Ecology Progress Series. 602. 225–235. 6 indexed citations
2.
Okuzawa, Koichi, et al.. (2015). Status of resource enhancement and sustainable aquaculture practices in Japan.. AquaDocs (United Nations Educational, Scientific and Cultural Organization). 41–52. 1 indexed citations
3.
Nyuji, Mitsuo, Yukinori Kazeto, Hiroshi Suzuki, et al.. (2015). Greater amberjack Fsh, Lh, and their receptors: Plasma and mRNA profiles during ovarian development. General and Comparative Endocrinology. 225. 224–234. 54 indexed citations
4.
Gen, Koichiro, Sonoko Yamaguchi, Koichi Okuzawa, Hirohiko Kagawa, & Md. Samsul Alam. (2008). Novel expression of importin α homologue in marine teleost, Pagrus major. Comparative Biochemistry and Physiology Part B Biochemistry and Molecular Biology. 151(4). 420–427. 4 indexed citations
5.
Nomura, Kazuharu, H. Kagawa, Hideyuki Tanaka, et al.. (2005). Microsatellite genotypes in triploid Japanese eel (Anguilla japonica) induced by heat shock. Aquaculture. 247. 20. 1 indexed citations
6.
Yamaguchi, Sonoko, Hirohiko Kagawa, Koichiro Gen, Koichi Okuzawa, & Michiya Matsuyama. (2004). Silicone implants for delivery of estradiol-17β and 11-ketotestosterone to red seabream Pagrus major. Aquaculture. 239(1-4). 485–496. 12 indexed citations
7.
Amano, Masafumi, Takeshi Yamanome, Hideaki Yamada, Koichi Okuzawa, & Kunio Yamamori. (2004). Effects of photoperiod on gonadotropin-releasing hormone levels in the brain and pituitary of underyearling male barfin flounder. Fisheries Science. 70(5). 812–818. 29 indexed citations
8.
Amano, Masafumi, Masayuki Iigo, Kazumasa Ikuta, et al.. (2004). Disturbance of Plasma Melatonin Profile by High Dose Melatonin Administration Inhibits Testicular Maturation of Precocious Male Masu Salmon. ZOOLOGICAL SCIENCE. 21(1). 79–85. 34 indexed citations
9.
Okuzawa, Koichi, Koichiro Gen, Martijn Bruysters, et al.. (2003). Seasonal variation of the three native gonadotropin-releasing hormone messenger ribonucleic acids levels in the brain of female red seabream. General and Comparative Endocrinology. 130(3). 324–332. 63 indexed citations
10.
Amano, Masafumi, Kataaki Okubo, Kazumasa Ikuta, et al.. (2002). Ontogenic origin of salmon GnRH neurons in the ventral telencephalon and the preoptic area in masu salmon. General and Comparative Endocrinology. 127(3). 256–262. 11 indexed citations
11.
Holland, M. Claire, Yoav Gothilf, Iris Meiri, et al.. (1998). Levels of the Native Forms of GnRH in the Pituitary of the Gilthead Seabream,Sparus aurata, at Several Characteristic Stages of the Gonadal Cycle. General and Comparative Endocrinology. 112(3). 394–405. 93 indexed citations
12.
Ohta, Hiromi, Hirohiko Kagawa, Hideki Tanaka, Koichi Okuzawa, & Keiji Hirose. (1996). Changes in fertilization and hatching rates with time after ovulation induced by 17, 20β-dihydroxy-4-pregnen-3-one in the Japanese eel, Anguilla japonica. Aquaculture. 139(3-4). 291–301. 147 indexed citations
13.
Ohta, Hiromi, Hirohiko Kagawa, Hideki Tanaka, Koichi Okuzawa, & Keiji Hirose. (1996). Milt Production in the Japanese Eel <i>Anguilla japonica</i> Induced by Repeated Injections of Human Chorionic Gonadotropin. Fisheries Science. 62(1). 44–49. 75 indexed citations
14.
Okuzawa, Koichi, et al.. (1994). Molecular Cloning of a cDNA Encoding the Prepro-Salmon Gonadotropin-Releasing Hormone of the Red Seabream. General and Comparative Endocrinology. 96(2). 234–242. 25 indexed citations
15.
Tanaka, Hideki, Hirohiko Kagawa, Koichi Okuzawa, & Keiji Hirose. (1993). Purification of gonadotropins (PmGTH I and II) from red seabream (Pagrus major) and development of a homologous radioimmunoassay for PmGTH II. Fish Physiology and Biochemistry. 10(5). 409–418. 83 indexed citations
16.
Okuzawa, Koichi, Masafumi Amano, Katsumi Aida, et al.. (1993). Chromatographic and immunological identification of gonadotropin-releasing hormone in five marine teleosts. Fish Physiology and Biochemistry. 12(4). 337–345. 10 indexed citations
17.
Amano, Masafumi, et al.. (1992). Effects of olfactory tract section on brain GnRH distribution, plasma gonadotropin levels, and gonadal stage in goldfish. ZOOLOGICAL SCIENCE. 9(4). 765–773. 20 indexed citations
18.
Amano, Masafumi, Koichi Okuzawa, Tadashi Yanagisawa, Yoshihisa Hasegawa, & Katsumi Aida. (1992). Immunoreactive Gonadotropin-Releasing Hormone (Ir-GnRH) in the Carp Brain. NIPPON SUISAN GAKKAISHI. 58(3). 593–593. 2 indexed citations
19.
Okuzawa, Koichi, Kiyoshi Furukawa, Katsumi Aida, & Isao Hanyu. (1986). Studies on the reproductive rhythms of fishes. XXI Annual reproductive cycle of the honmoroko Gnathopogon elongatus caerulescens.. NIPPON SUISAN GAKKAISHI. 52(11). 1957–1960. 13 indexed citations
20.
Sano, Mitsuhiko, Koichi Okuzawa, Takashi Yamakawa, & Kenji Mochizuki. (1984). A Probable Hybrid Butterflyfish of the Genus Chaetodon from the Ogasawara Islands. Japanese Journal of Ichthyology. 31(1). 79–82. 3 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by Evaristo L. Mañanós Breakdown of academic impact, for papers by Sylvie Dufour Breakdown of academic impact, for papers by Makito Kobayashi Breakdown of academic impact, for papers by Finn‐Arne Weltzien Breakdown of academic impact, for papers by Hirohiko Kagawa Breakdown of academic impact, for papers by H.J.Th. Goos Breakdown of academic impact, for papers by Z. Yaron Breakdown of academic impact, for papers by Michiya Matsuyama Breakdown of academic impact, for papers by Bernard Breton Breakdown of academic impact, for papers by Kohei Yamauchi
Rankless by CCL
2026